HADRONES

Author: VIJANDE ASENJO JAVIER.
Year: 2004.
University: SALAMANCA [www.usal.es].
Place of defense: FACULTAD DE CIENCIAS.
Place of preparation: FACULTAD DE CIENCIAS.

Summary: To understand the nature of the new resonances hadrónicas is important to have a model that allows us to compare the states observed experimentally with the theoretically predicted, offering it for the constituent quark model one of the most complete descriptions of the properties hadrónicas. In this dissertation we have designed a constituent quark model suitable for the study of the properties of hadrones in all sectors of flavor. To find new physics is important to test any theoretical model with respect to the largest possible number of states known to the goal of clearly understand their strengths as well as their potential weaknesses, this being the only way that will be able to extract reliable predictions. Therefore, using the model we have built, we have conducted a comprehensive analysis of all spectroscopy hadrónica, from inns to multiquarks. First we have to show how it relates to our constituent quark model with the main properties of QCD (Cromodinámica Quantum), paying particular attention to the various terms that make up our potential for interaction. Then we applied this model to the problem of two bodies, inns, analyzing their spectroscopy from sectors lighter in the range of hundreds of MeV to the high-energy excitation around the 11 GeV. We also have studied the effects exerted by confinement in the spectrum of heavy inns. Once analyzed the problem of two bodies has been spent to study the system of three quarks, the baryons, analyzing the spectrum of sectors slight, strange and enchanted. Again there has been analyzing the effect of confinement on states of higher energy spectrum bariónico proposing an explanation for the problem of "lost States." Finally, we have studied four different scenarios where it has been suggested that there might configurations of four quarks, the so-called tetraquarks and their coupling to the system of two bodies in those states whose quantum numbers can be obtained simultaneously in both configurations.

Author: RIOS HUGUET ARNAU.
Year: 2006.
University: BARCELONA [www.ub.es].
Place of defense: FACULTAD DE FÍSICA.
Place of preparation: FACULTAD DE FÍSICA, UNIVERSIDAD DE BARCELONA.

Summary: The main contribution of this thesis concerns the application of the formalism of Luttinger-Ward the study of the thermodynamic properties of nuclear matter. This formalism is used to obtain different thermodynamic potential from the Green's functions and thus a consistent theoretical framework in which the microscopic properties and the microscopic nuclear can be portrayed at the same level. In this thesis, the formalism of Luttinger-Ward has been applied to the nuclear field for two different approaches. In the Hartree - Fock approximation, the results are unrealistic, but check the validity of the formalism for the field environment. In the approximation of stairs, the application of functional Luttinger-Ward leads to resutlados analytical potential for thermodynamic from the microscopic properties of the system. Thus, using the scheme of Functions Greeen Autoconsistentes, which provides a realistic description of the nuclear system microscopic level, we get a number of properties micrsocópicas (spectral functions, NN interaction in the nuclear, etc.). That can be used directly in calculating the thermodynamic of the observable matter dense. In particular, this theory has paid particular attention to calculating the entorpía a system of nucleons correlated in approximate quasi-partícula dynamics. From this amount, it has obtained the free energy, as well as other potential thermodynamic system, which allows us to characterize a macroscopic level. Likewise, it has demonstrated the consistency of the thermodynamic approach from the calculations of potential chemical macroscopic and microscopic. Finally, it has been studied in a qualitative manner transition líquido-gas the nuclear field.